ollidev.com

The AI developer
you're looking for.

Freelance AI Product Engineer. I design, build, test and deploy. Fast.

Olli Hämäläinen, headshot
Olli HämäläinenAI Product Engineer
Limited availability

€120/h + VAT · project pricing on request

Beliefs

How I think about work

  1. Shipping fast for faster learning.

    • Speed is a superpower.
    • Small teams ship faster.
    • Product adoption beats shipping code.
    • Listen, build, ship, tell the customer.

  2. Compound daily through curiosity.

    • There's no substitute for putting in the hours.
    • Get 1% better every day.
    • Your best work comes from following your curiosity.
    • Devil is in the details.

  3. Think for yourself.

    • Make decisions and be prepared to explain them.
    • Have strong opinions, loosely held.
    • Challenge and check AI output. The first answer isn't usually correct.
    • Anecdotes from customer conversations > data.

  4. Clarity is a deliverable.

    • Leaders step up to provide clarity when clarity is absent.
    • Manage expectations or reality will.
    • Assumptions are the root cause of all evil.

  5. Serve and be useful.

    • Being helpful compounds.
    • Be authentic and own your failures.
    • Be the person taking notes, even if it's just for yourself.

Experience

Fifteen years at product companies. Now building AI products.

I'm a full-stack developer focused on AI-enabled products with nice-looking UIs. I turn ideas into working software. I'm AI-native developer, mainly usign Claude Code and OpenAI Codex, with emphasis on product quality.

My emphasis to product quality comes from 15+ years across product development, software engineering, and customer-facing roles. I've see big and small organizations and know what great looks like.

Before freelancing I spent nearly a decade at Smartly.io leading a global support team, debugging hands-on a mountain of customer cases, built product features, and ran performance marketing campaigns for global advertisers. That mix of hands-on engineering and product thinking helps me scope the smallest thing that works.

What I do

  • Build reliable agents across OpenAI, Claude, and Gemini with tools, guardrails, tracing, evals, and analytics.
  • Ship LLM features like structured outputs, RAG search, and workflow automations that feel native to your product.
  • Deploy products on Hetzner and migrate apps off Lovable, Vercel, or Render.
  • Migrate and rewrite early AI prototypes into the next version of the product.
  • Keep costs predictable and performance reliable through tracing, caching, and monitoring, including for AI workloads.
  • Help build AI products and companies.

Tech Stack

Frontend
React, Next.js, Astro, Tailwind CSS, Shadcn/ui, Next-intl
Backend
TypeScript, Node.js, Bun, Hono, Zod, Better Auth, Python, FastAPI
Data
PostgreSQL, pgvector, SQLite, Supabase
AI
OpenAI API, Claude API, Gemini API, ElevenLabs, Vercel AI SDK, Langfuse, LangChain, Chroma, Docling
Infra
Hetzner, Docker, Coolify, Vercel, Render, Github
Product
Stripe, PostHog
AI coding tools
OpenAI Codex, Claude Code

Customers

What they say.

  • Olli was able to help me build a prototype further and learn in the process. That was exactly what I needed.

    Mika, CEO at StratXcel.tech
    Mika CEO · StratXcel.tech

  • Olli's proof-of-concept for our AI report generation, including a compelling sales demo video, was key to rapidly acquiring initial test customers and validating our product direction.

    Kristian, CEO at Työpaikkaselvitys.fi
    Kristian CEO · Työpaikkaselvitys.fi

More customer testimonials and references available by request.

FAQ

Quick answers.

What services do you offer?
Prototypes, proofs of concept, and launch-ready products. Scoping, design, engineering, deployment, and iteration handled. One human point of contact throughout, replying in hours not days.
How much does it cost?
€120/h + VAT, or fixed project pricing on scoped work. The first call is free.
How fast can you deliver a prototype?
A first working iteration usually lands in days, with constant communication and rapid follow-ups.
What is the minimum commitment for a project?
One day. Most projects run weeks or months, but small prototypes and proofs of concept can be done in days. I'm flexible on how we work together, including the duration.
Are you willing to join a startup as CTO?
If we haven't worked together before, no. We can do a paid project together, and that will tell if I'm a fit for the startup.
Where are you based and how do we work together?
I'm based in Hämeenlinna, Finland. I work remotely worldwide. I can travel to Helsinki and Tampere for first meeting and occasional workshops when needed.